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I have a 23" iMac running Lion (10.7.3). I've checked that the "Enable HiDPI display modes" checkbox is enabled in "Quartz Debug" (it was checked the first time I opened it), but there are no HiDPI resolution options in my display settings.

Has anyone had success with using HiDPI display modes on a 23" iMac?

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I have the same problem and even after logging out and back in and restarting, HiDPI mode does not work at all. When I log back in, the checkbox is unchecked. –  daviesgeek Jun 8 '12 at 5:29
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2 Answers

up vote 3 down vote accepted

Per the instructions on the screen, you have to log out and back in when enabling or disabling HiDPI mode for the changes to take effect:

enter image description here

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Do you know what they mean by "virtual display modes" here? –  Ken Jun 15 '12 at 23:36
    
@Ken Virtual displays refers to hooking up a retina iOS device as a second monitor, and enabling the HiDPI mode on that "display". –  daviesgeek Jun 20 '12 at 5:41
    
This doesn't work for me...still... –  daviesgeek Aug 2 '12 at 6:23
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If the checkbox is already enabled, but it doesn't work, disable it, logout when prompted to, login again, re-enable it and at the next login you should find the HiDPI settings in the Displays settings.

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Do you know what causes this problem? I had two accounts logged in and had to sign out both accounts before I could successfully change the setting. –  Aeyoun Jun 29 '12 at 7:57
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